Etymology
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iffy (adj.)

1937, American English, from if + -y (2). Originally associated with President Franklin D. Roosevelt.

updated on June 23, 2012

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Definitions of iffy from WordNet

iffy (adj.)
subject to accident or chance or change;
an iffy proposition
Synonyms: chancy / fluky / flukey
From wordnet.princeton.edu, not affiliated with etymonline.